DZ468合金高周疲劳性能研究
收稿日期: 2009-09-10
修回日期: 2010-03-25
网络出版日期: 2010-06-11
STUDY ON HIGH CYCLE FATIGUE PROPERTIES OF DZ468 SUPERALLOY
Received date: 2009-09-10
Revised date: 2010-03-25
Online published: 2010-06-11
刘恩泽 . DZ468合金高周疲劳性能研究[J]. 金属学报, 2010 , 46(6) : 708 -714 . DOI: 10.3724/SP.J.1037.2009.00600
The high cycle fatigue properties of a new type Ni-based superalloy DZ468 were investigated in this paper. The high cycle fatigue strengths of DZ468 alloy at 900 and 760 ℃ with a ratio of stress R=-1 reach 290 and 300 MPa, respectively. The high cycle fatigue fractures of DZ468 alloy were composed of fatigue source, fatigue district and final stage. Cracks originate from surface, sub-surface and inner defect of sample. At 900 and 760 ℃, stage I and stage II crack propagation could be observed from fatigue fracture, which was caused by the combination action of planar slip, cross slip and climb of dislocations. With increasing of stress value, the crack propagation rate quickly increase. A correlation exists between the crack propagation mode and deformation mode.
Key words： Ni-based superalloy; high cycle fatigue property; fracture
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